Add Iterable.fold (and Stream.fold) which replace `reduce`.

sdk/lib/web_sql/dart2js/web_sql_dart2js.dart

 /**
  * An API for storing data in the browser that can be queried with SQL.
  *
  * **Caution:** this specification is no longer actively maintained by the Web
  * Applications Working Group and may be removed at any time.
  * See [the W3C Web SQL Database specification](http://www.w3.org/TR/webdatabase/)
  * for more information.
  *
  * The [dart:indexed_db] APIs is a recommended alternatives.
  */
@@ skipping 249 matching lines @@
     // Note: NodeLists are not fixed size. And most probably length shouldn't
     // be cached in both iterator _and_ forEach method. For now caching it
     // for consistency.
     return new FixedSizeListIterator<Map>(this);
   }
 
   dynamic reduce(dynamic initialValue, dynamic combine(dynamic, Map)) {
     return IterableMixinWorkaround.reduce(this, initialValue, combine);
   }
 
+  dynamic fold(dynamic initialValue, dynamic combine(dynamic, Map)) {
+    return IterableMixinWorkaround.fold(this, initialValue, combine);
+  }
+
   bool contains(Map element) => IterableMixinWorkaround.contains(this, element);
 
   void forEach(void f(Map element)) => IterableMixinWorkaround.forEach(this, f);
 
   String join([String separator]) =>
       IterableMixinWorkaround.joinList(this, separator);
 
   Iterable map(f(Map element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
@@ skipping 193 matching lines @@
 @DomName('SQLTransactionSync')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.SAFARI)
 @Experimental
 class SqlTransactionSync native "*SQLTransactionSync" {
 
   @DomName('SQLTransactionSync.executeSql')
   @DocsEditable
   SqlResultSet executeSql(String sqlStatement, List arguments) native;
 }